在下列网络拓扑结构中，中心结点的故障可能造成全网瘫痪的是( )。A．星型拓扑结构

Wen Genying was born in 1987 in South Korea. She is a very f _小题1:_ actress. She has many fans all over the w _小题2:_. She likes to p _小题3:__ the piano and read comic books when she is f _小题4:__. And she is good at swimming and dancing. She has a h _小题5:__ family. Her grandmother helps her a lot w_小题6:_ her acting and teaches her Japanese. She often helps    p __小题7:__ people and gives away some m _小题8:_ to the people in n __小题9:__. She also sets up a Wen Genying Scholarship(奖学金) for s __小题10:__. I think we should learn from her.

大肠的主要生理功能是（）

A.受盛

B.传化糟粕

C.化物

D.泌别清浊

E.通行元气

故障树分析是用一系列事件符号、( )和转移符号描述系统中各种事件之间的因果关系。

A．集合符号

B．运算符号

C．几何图形

D．逻辑符号

土壤是由（）、液体和气体组成的三相复合系统

一般附加险可以在主要险别基础上加保，也可以单独投保。( )